. Introduction to structural and systematic botany, and vegetable physiology. Botany. SAP-WOOD AND HEART-WOOD. 125 for which their tubular and capillary character is especially adapted. But the ducts in older parts, except when gorged with sap, contain air alone ; and in woody trunks the sap continues to rise year after year, to the places where growth is going on, mainly through the proper woody tissue of the wood. In this transmission the new layers are most active, and these are m direct communication with the new roots on the one hand and with the buds or shoots and leaves of the season on
. Introduction to structural and systematic botany, and vegetable physiology. Botany. SAP-WOOD AND HEART-WOOD. 125 for which their tubular and capillary character is especially adapted. But the ducts in older parts, except when gorged with sap, contain air alone ; and in woody trunks the sap continues to rise year after year, to the places where growth is going on, mainly through the proper woody tissue of the wood. In this transmission the new layers are most active, and these are m direct communication with the new roots on the one hand and with the buds or shoots and leaves of the season on the other, So, by the formation of new annual layers out- side of them, the older ones are each year removed a step farther from the region of growth; or rather the growing stratum, which connects the fresh rootlets that imbibe with the foliage that elabo- rates the sap, is each year removed farther from them. The latter, therefore, after a few years, cease to convey sap, as they have long. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gray, Asa, 1810-1888. New York [etc. ] Ivison, Blakeman, Taylor & Co.
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1850, booksubjectbotany
